Manual - Zn-401s

Calibration is mandatory. The manual will detail two methods:

There are two primary ways to program the ZN‑401S: (fastest, but you need the correct code) and automatic code search (slower, but works even if you do not know the code). zn-401s manual

The station’s primary generator, a hulking beast of an engine that kept the remote listening post alive, had been acting up for days. Mechanics had come and gone, baffled by the noise. It wasn't a mechanical clatter; it was a hum. A low, thrumming frequency that gave the entire crew migraines and made the fillings in their teeth ache. It was the kind of sound that made men lose their minds. Calibration is mandatory

Follow the wiring diagram carefully. Improper wiring can damage the unit. Mechanics had come and gone, baffled by the noise

He opened the manual to

The calibration weight is incorrect or unstable. Solution: Use the exact weight listed on the device’s sticker (e.g., CAL 100g). Ensure the surface is level.